简便计算5/8-1/4×(8/9÷2/3)=5/8-1/4×4/3=5/8-1/3=7/24
图
5/8-1/4x(8/9÷2/3)=5/8-1/4x(8/9x3/2)=5/8-1/4x4/3=5/8-1/3=15/24-8/24=7/24